Abstract: The Ordovician reservoirs in Halahatang area are an important field for increasing oil reserve and production of ultra-deep marine carbonate rocks in Tarim Basin. However, the internal fractures are developed, the distribution of oil and gas is extremely complex, and well groups with high yield and stable production are formed only in local areas. Therefore, the study of oil and gas enrichment patterns and their main controlling factors is of great significance for the efficient development of oil reservoirs in this area. Based on the data of drilling, core, rock thin sections and production practices as well as the analysis of strike-slip fault structures and karst reservoirs, the paper explores the control effect of Ordovician carbonate strike-slip faults on reservoir development and hydrocarbon accumulation in Halahatang area. The Ordovician reservoirs in Halahatang area develops X-type conjugate strike-slip faults in NE and NW directions, and the strike-slip faults in NE direction had succeeding fault activity in the Late Hercynian, Yanshan and Early Himalayan periods, characterized by strong segmentation, which is conducive to multi-phase oil and gas migration and accumulation. The study area is dominated by the Ordovician carbonate fractured cave reservoirs, and there are three types of fractured cave reservoirs developed under the control of fault or karst, and the co-control of fault and karst, which are most developed in the area under the superimposed effect of faults and karst. Restricted by the orientation, stage and segmentation of faults, the Ordovician oil reservoirs in Halahatang area are mainly distributed in the local areas of strike-slip fault zone in NE direction, and there are three types of oil enrichment models, i.e., fault-buried hill type, fault-karst co-controlling type and fault controlling type. Based on the fault-controlled oil reservoir enrichment pattern, the proportion of newly drilled profitable wells has significantly increased since 2020, and the exploration efficiency has been significantly improved. In conclusion, the research reveals the large-scale hydrocarbon accumulation and differential enrichment mechanism in ultra-deep dense carbonate rock strike-slip fault zones, which can provide a reference and also new ideas for the efficient development of complex reservoirs controlled by ultra-deep faults.